Valve mechanism



July 1o, lszsf v1,616,666

F. L. PIVOTO VALVE MECHANISM Filed Aug. 18. 1927 Patented July 1G, 1928.

unire .PATENT lVALVE lvrnoHANIsM. y

Application led August 18, 1927. Serial No. 213,802.

This invention relates to new and useful improvements in a valve mechanism. v

One object of the invention is to provide a valve mechanism specially adapted for use in connection with a. set shoe with which the lower end of the screen or pipe is equipped, when setting the same in a well.

Another object ofthe invention is to provide a novel' type of Huid back pressure valve in connection with a valve guide and valve' protecting screen.

A further feature of theinvention is to provide a novel type of back pressure valve adapted to be assembled withk a set shoe and of such construction as to provide for a greater' clearance for the passage of fluid than is the case with back pressure valves now in common use for such purposes and embodying Valso a novel type of screen for protecting the valve from the accumulation of foreign' matter.

With the above andother objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein Figure 1 shows a vertical sectional view of a set shoe attached to the lower end of a well screen and showing the back pressure valves assembled therewith.

FigureA 2 shows a cross sectional view taken, on the line 2-2 of Figure 1, and

Figure 3 shows a cross sectional view taken on the line 3-3 of'Figure 1.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1 designates atubular set shoe of conventional construction whose lower end iscontracted and of oval formation,.as at 2, so that it will readily vfollow the course of the bore in setting the screen or other` pipe to 'which the set screen is attached. This lower end is detachable 'and is threaded up into a section of the shoe aboveitwh'ich is internally threaded'as at 3. The upper end of' the setshoe is internally threaded as at 4, and a tubular wash pipe seat 5 is screwed therein and has its upper end 6 flared to receive the lower end of the 'wash pipe. The set shoe is screwed on to the lower end of the screen or pipe seat 5f Then the screen or pipe' 7 is set,

it is desired to wash the outside of thesame a wash pipe is lowered therein and its lower' end is seated in the flared upper end 6 of the seat 5 and clean water is forced'down through said wash pipe, said water passing on down through the valves, assembled with the set shoe, and hereinafter described, and passes out through the opening 8 at the lower end of the set shoe and'up around said screen.

Normally however7 said valves are closed to prevent the inflow of Huid into the screen 7 up throughsaid set shoe. The lower end of the wash pipe seat 5 is formed with'an annular valve seat 9 having a central opening 10. Spanning the wash'pipe seat 5 and preferably formed integral therewith there is' a spider 11, above the valve seat having a central. bearing 12 which is preferably flared eachway. The numeral 13 designates the lower annular valve seat which is screwed up into the set shoe 1 and which has a central opening 14.v Formed integrally `within the valve seat 13there is a spider preferably consisting of the oppositely disposed upwardly converging legs 15,15, whose upper ends are united by a ringy 16 havinga central bearing 17 therethrough which is flared each way. There are the upper and lower valve stems 18, 18, which depend through the respective bearings 12, 17 and whose upper ends are formed with heads 19, 19 having convex surfaces which workinfdownwa'rdly converging joints ,into Vwhich the upper ends of the respective 'bearings 12, 17 are, formed. There are the conical shaped back' pressure valves 20, 20, slidingly mounted on the re-` spective stems 18, 18l and these respective valves havev the depending housings 21, 21, which are perforated or formed of foraminated material.` These valves .normally control the openings 10, 414:I respectively and prevent the upward passage ofliuid through the set shoe but `open to permit the downe ward passage thereof. yWithin each housing 21 there is a packing 22 which closely surrounds the correspondingstem 18 and prevents leakage up through the valves and which are held in placebyglands as 23 fitted around the stems and held against the underside of said packing rings. There are the washers'24 which are maintained on the lower ends of the stems, by the nuts 25 screwed thereon, and which t closely within said housing and between 'the WashersQi loo and the corresponding glands 23 and surrounding` the stems 1S there are the coil springs as 26 which normally operate to hold the glands 23 against the packing 22 as well as to maintain the valves 20 seated. The seats 12 and 17 are so formed as to permit the stems 18 to freely swing laterally in any direc ion when the corresponding valves are open by fluid pressure from above and this permits said valves also to swing laterally as indicated in dotted lines in Figure 1. This freedom ofmovement of the valves provides a greater clearance for the additional passageof fluid as well as the passage of foreign matter through thev openings 10 and 14,

In order to prevent the entrance of foreign matter into thevalves, particularly large particles of foreign matter which. are liable to clog said valves,1 have provided a tubular screen as 27 whose upper end is closed and whose lower ent is threaded into 4the upper end of the wash pipe seat 5 within the flared upper end 6 thereof. rl`his screen is perforated or foraminated and may be of a llength to give `the required screening capacity and it will be effective to exclude particles of foreign matter from the valves by which they are liable to be clogged or held open. This screen isvthreaded into the. wash pipe by means of left hand threads.

The housings, 21 are also perforated, as hereinbefore stated, so that any foreign mattereollecting therein may be readily ejected. Vhile I have shown what I now-consider the` preferred forni of this valve mechanism it is obvious that various mechanical changes ymay be made therein and equivalents substituted for the parts'. shown and it Ais contemplated that such changes and adaptations maybe made in the structure as are comprehended within the scope kof the appended claims.. n f y 1. A valve mechanism including a valve seat having an opening, adownwardly opening valve controlling said opening, a bearingmember above saidseat having a bearing therein, a stem supporting the valve and working ythrough and having a swiveling connect-ion with said bearing,v a y-ieldable member associated with the stein and normally holding said valve in closed position, a screen disposed above the seat and provided to exclude foreign matter therefrom.

2. A valvel mechanism` including a valve seat having an opening, a downwardly opening valve controlling said opening, a spider disposed above said seat and formed with a bearing aligned with said opening, a valve stem to the lower end of which said valve is connected, saidV stem working through said bearing and havinga universal connection therewith to provide free lateral play of the valve relative tothe seat, means normally holding said valve yieldingly against said seat and a screen disposed above the seat and provided to exclude foreign matter therefrom.

3. A valve,mechanism including a seat havin(Y an opening, Va spider dispo-sed above the seat and having a bearing aligned with said opening, a stem extending through said bearing and sustained thereby, a valve associated with the lower end of said stem andi normally closing` said opening, said valve having a depending foraminated housing an abutment carried by the lower end of the stem, a yieldable member enclosed within said housing and interposed between saidtvalve and abutment and normally holding the valve yieldingly' against its seat in position to close the opening thereof.

4t. A valve; mechanism including a seat having an opening therethrough, a spider disposed above said seat, a downwardly opening valve controlling said y,opening-v, a

,stein on which the valve is slidably mounted,

the upper end of said stem having a head which has a swiveling connection with said spider,` anv abutment carried by thelower end of the valve stem, a foraminate'd housing depending fromsaid valve, a yieldablc memberenclosed by said housing and interposed between said abutment and valveand normally holdingthe valve yieldingly against its. seat in. position to close said opening.

k5.. A valve. mechanism including a seat having an kopening therethrough, a spider disposed above said seat, a downwardly opening valve controlling said opening, a stem on which said valve is mounted, the. upper end of the stem having a head which has a` swivelling connection with said spider, an abutment carried by the lower end ofthe valve stem,ayieldable member interposed betweenI said abutmentl and valve and normally holding the valve yieldingly against its seat in position to. close said opening, a housing carried by the valve and enclosing 'said yieldabley member, said housing being provided with perforations.

6. A valve mechanism including a valve` seaty havingan opening therethrough, a spider disposed above said seat and having a bearing, a valve stem whosev upper end has a swiveling connection with said spider and which works through saidy bearing and opening, a downwardlyopening valve controllingv said opening and having a bearing onvsaid stem, a foraminated housing depending from said valve, a packing within the housing around the stem, a gland the housing abutting said packing, an abutment carried by the lower end of the stem, a yieldable member interposed between said abutment and gland and enclosed by said I housing.

A valve mechanism including a 'valve seat having an opening therethrough for the passage of fluid, a downwardly opening valve controlling said opening, an anchor associated with said seat, a valve stem sustained by the anchor and having a `swing-V ing connection therewith, said valve being connected to said stem, a oraminated housing depending from the valve, a yieldable member within said housing and sustained by said stem and normally operating to hold the valve yielding against said seat and in position'to elo-se said opening.

8. A valve mechanism including a tubular supporting member, a valve seat therein having an opening, a downwardly opening valve controlling said opening, an anchor associated with said seat, a valve stem sustained by the anchor and having a swinging connection therewith said valve being connected to said stem, a housing depending from the valve, a` yieldable member within said housing and sustained by the stem and normally operating to hold the valve yieldingly against said seat and in position to close said opening.

9. A valve mechanism including a valve seat having an opening therethrough for the r passage of uid, a downwardly opening valve controlling said opening, an anchor associated with said seat, a valve stem sustained by thev anchor and having a swinging connection therewith, said valve being connected to said stem, a yieldable member sustained by the lstem and normally operating to hold the valve yieldingly against said seat and in position to close said opening.

10. A valve mechanism including a tubular member having a. valve seat in its lower end provided with an opening. a transverse spider in said tubular member above said seat having a bearing, a stem litted through said bearing and having a swinging connection therewith and extending through said opening, a downwardly opening Valve slidable on said stem and controlling said opening, a yieldable member sustained by the stem and normally operating to holdthe valve yieldingly against said seat in position to close said opening.

11. A valve mechanism including a tubular member having a valve seat in its lower end provided with an opening, a transverse spider in said tubular member above said seat having a bearing, a. stem litted through said bearing and having a swinging connection therewith and extending through said opening, a downwardly opening valve slid-v able on said lstem and controlling said opening, a yieldable member sustained by the stem and normally operating to hold ythe valve yieldingly against said seat in position to close saidopening, and a screening device attached to the upper end oit said tubular member.'

In testimony whereof I have signed my name to this specification.

FELIX L. PIVOTO. 

